A critical-systems backup saves space by using which backup method?

A critical-systems backup saves space by using which backup method?

• A. Differential
• B. Incremental
• C. Full
• D. Copy

Answer: (B)

Incremental backups maximize space efficiency by recording only what has changed since the last backup in the chain. After an initial full backup, each new backup contains just the data that changed since the previous backup, so the amount of data stored grows slowly and saves storage compared with backing up everything each time. For restores, you’d restore the latest full backup plus every incremental backup in order to reconstruct the current state. This is why incremental is the best fit for space-saving in critical-system backups. By contrast, a full backup saves everything and uses the most space; a differential backup saves all changes since the last full backup and grows larger over time; a copy backup duplicates selected data outside of a chained sequence, offering less efficiency for ongoing storage savings.

Incremental backups maximize space efficiency by recording only what has changed since the last backup in the chain. After an initial full backup, each new backup contains just the data that changed since the previous backup, so the amount of data stored grows slowly and saves storage compared with backing up everything each time. For restores, you’d restore the latest full backup plus every incremental backup in order to reconstruct the current state. This is why incremental is the best fit for space-saving in critical-system backups.

By contrast, a full backup saves everything and uses the most space; a differential backup saves all changes since the last full backup and grows larger over time; a copy backup duplicates selected data outside of a chained sequence, offering less efficiency for ongoing storage savings.